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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2882f86b529bdd9461563bb2c89318d4bdd1688613b17685be5ee9b84ac092' 
  AND token = 'nZSnhJNGQmXv46b6yNuHrEvA8gOeIy1uQfaYNeUMljE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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