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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a67fd4b1be7df75d3bbed731f684870ca3ede848755f5d004e4f2306d391845' 
  AND token = 'ygxuE4vhPddBf1P8bTBTij9cuq3JFp7g4w0PIE0s2sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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