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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4299b0ec919fcc54aed6a33e9d2f7e3b257e7a549755390a1431855d91cf60cb' 
  AND token = 'fLP1SDsIJPTJqvIDpEc2aDSK7xDkXpfxOSvfNEx8b2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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