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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6040b266509be654d06939108b93b0b6eb0b552f85ca44256688a52b7468c470' 
  AND token = '/JSkDKvbqyc6C8l2xQveHwY6TnH07llpNATSNwds9/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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