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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2914e61969e693593bbd0501b58ecf730fde7e9a4470fc3440051cc1a0fd8d' 
  AND token = 'stmwvAAQkE/Lb30QCt2RUukZTgEMTUb02zyaaolB5mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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