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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821689acdbee46fc9957f84422fab0818a9f52ff0207ab2fac7fa2aa52888eab' 
  AND token = 'kk92kVE4LAYdL53xR5QQbenIPIZTubrtitbjJzlksQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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