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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b8027a28b8ff76578c627104b6e25e4a8d24da96f7dec79a7c4198199b2d16' 
  AND token = '6Y+r1S+o/hb95ZXCiOdwdQoBsqSZvYrvOImkyoZE4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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