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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b233e38cf45ff2367f431de7a816cbc2bb41e23a461c51bbf48080be9db43cb4' 
  AND token = 'G9kMoyD3BR7uiIJSkZ2cSEwWJjop3VxAH9rXdz5dR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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