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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ba5f9e56994db61c0589170f52206511ac3bbe6c258d2bcccf14f3bd03a7e9' 
  AND token = 'hVZg2+4UUEF/JCg1FmmBMycQkF+odlTLrh6NrO3Q2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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