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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c4561e1f4c077670b24139cda52101513cfb705b9231e21c710b2cedaab365' 
  AND token = 'BeIRGeAUvQ5Wg30JMjbWmx17g5lDq/D9q4VwBJUThkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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