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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f80a58e53069e5ac0f47bad0991b87337d07512a4dd9a04eb7c053fcd90e52' 
  AND token = 'eGykizjsSCdVIx23kuKN04Fos1UTkDmmvbIVyqQyB2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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