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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20a4d193053f56213ef406adb183c29c4e28a6f523d2bc6cda855b060334e0b' 
  AND token = 'lxllBpT4aMXh9ozWJe0uQc4KCgnQPYBNZUGcC7Bo2BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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