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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b160c02a0ac5460a4df947b1cba2b48590e0b3177add7df82365bb2a15e67a' 
  AND token = '8LXyVUEf1E6t00IjejbrwOoiNIBpbLJ2JTulIdpKbCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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