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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b1ad3aa8fbe259e333ed2a63f8a40f20bfad08c2cec177e4e999ba03c2ac58' 
  AND token = 'iJsYuwjxI6QGE4PIEI0MEEGRtj9vsR2Y6o0zzfL2jNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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