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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ace08115d07c05f0b2fd0e04bdbacf501c1762490325e1f67b72181a94d87c' 
  AND token = 'PW5cSB9kH0gVaVCX+2hi+FtmiVsHysPYdYvST1nh4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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