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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3bca001e455aa3aa6d09db09c2db1782a7f0b04fb24331b6771dd9471f80ac' 
  AND token = 'WRR+rTwLTpZ8bTJ0DAsvQN4Qqv24SBg/o4iaOSO9z6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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