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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb575363218de3498232eff001d25f38400a52a91bb87e155b98d86b8df6c285' 
  AND token = '5CCvIkFfu9mdRsX8ZsDQapnHzVCdP33Hkdvwaa7gnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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