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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db75d16fc6c3059ff8b17b3ae4f5ce8dc9c9cbdc221d33b18c3b8e438445c24c' 
  AND token = 'Cs0+RlgqIdiBq/pzTUMIdvdjai32ard6xFgj7E413cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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