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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88317739280f77001acfbb3239ba67c225b31de90c7329844f530d728e8b5f81' 
  AND token = 'FXabCspQZz2His1Hk0f5syeLfl9aeS+vi0pHLfPD5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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