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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03df1d78e2eb16886ed1246669552c432bb495536510d16090e7d6670fcf5277' 
  AND token = 'DJbm4L3B2o6NfI6O7kHmwZwZu8gmn/4CR68oRV4SOEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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