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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11da2b272bbd75c40fc2c488b5ec514a8a53c5da58e5e3342227937938a32e1' 
  AND token = 'ZsARWmXzqW2l/hnFdILYoQaPemKa44+Qsp0LAafqKcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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