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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d82a7aa77252f49f532a9da2a9221cff35d60c49e49c0804dfe7ea11ce0c1b' 
  AND token = 'NfKYYYgGZ55p03BRlrs9GtogDoib0fbaygpYSsGNjIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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