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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84879c6e60d56a8ec97db90508589d31af8d8a3f7801d4847ca3a95c610ddcc3' 
  AND token = 'C5OioXNNPzGvueVtPOF05qo4W5KTbnKdk/tGFTP8Sw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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