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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a9e872052deced43254b8bef799c48862ed8e9542b58b055419acf46241cbf' 
  AND token = 'iW6foxqjC/g7qjHKrK+9wQmB184HbudNykD486QE3vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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