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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f009714a8619948abd3de4b72097f0083ac20fbaa6296a7511a9a6a296cd0a3' 
  AND token = 'IhpFdTI+MWC0td5mqwdF41D19iSvjkeOO1BaRroi/v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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