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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8465d45dd672ee99c95e8e2eb2d5884bb3d0edf7cbf5ce7ce5bb52f8187ad79' 
  AND token = '0nUcTC1/PY8dKVNQB5CCE0oyBPGnNHVZMmD8dPAitBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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