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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c20ad59cc2c6db093603f38204b928af99a09f0cfdaf4a5406f5cbd1ac0af' 
  AND token = 'PP1MxiASeIGlDXuvFPk7yR2p6Q+nKhQpySw1y6hRG/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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