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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da145f54cec614c821740004db9899b47fe719fe465f9647741da8d048a3abd' 
  AND token = '3btFNYJAKq2rHp6Ytgu+RIIou7ddISGLiynKE5r4L38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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