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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde8095e7532e36da7c34aee15d058548ec6dd3574066bb2db1f1327e9703ec8' 
  AND token = 'svvcOfjVw69FD29tGpl2sqbkTlHJ1vlxD5wseKyNXSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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