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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8a57af65f33e58c670e54a3b3dc358dc47ffb90b5ce38e8dca3c39524894a4' 
  AND token = '4ILBNNei08wYUsLAtlzvRRRJWz77ewOUFwUU8VOC/0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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