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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f495911b00022b2d8cce1e351850ba770e96d76a5c54f2e86b6e752b91208b1d' 
  AND token = 'C8DJdr9XVOsWGnBEQFJ6os97XmG9a/cQsQZXB07mevM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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