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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dded4305f0ce3ace047c2fac142dda2eb6fb1b6b091ce315952e6eb6628a7f' 
  AND token = 'Z0P59aDiVTerwnX1UzHttRXMdJykQ4+MoQvL2p516Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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