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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b593fe505bcdcbd6a718a1a9ce6d29623d77f017733690bcd9770b93241656f' 
  AND token = 'bJqKELk1Kuq8S2fzL15j3FeHteJe9UTX8xKb9jCsI5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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