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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bb20b7a30dcf9d2504579cf36c45ca76ee7b231114572bdbf443462849b25c' 
  AND token = 'n30HRJu7RUbNEZ4YXMc7NuNPiXiiVHwW8HWbbJ40NBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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