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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ac892eeeaa3a39c75760c6bf0e79078e1d00e3204368bcfb551f18f771e6d6' 
  AND token = 'y0spiDzHTKJSfvXnBGfcYAEMwYoRoYJg2y8FJAGBMJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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