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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2fc5f61d22f77afa69c7d290a021457b17aab84bf3944d99005d83d6ae7ea9' 
  AND token = 'PomQQTe/JwOxZitNe8KAZ8zdkLJ/Dvpe1/5kP2fNyOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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