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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83defa7511776f14720180010d728665bcba2d83985ec41559eeafee28e46fd4' 
  AND token = 'Pt3SYXhkB4Ot2+ekLBzf8CO66Ljba/fMjL+K1NTpyfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}