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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a0e71dbda39b9360f927a78ea07a8ffd918e21b3e9bfb5ba0abef5e3090c56' 
  AND token = 'JxvbzSzPo1RYgVH/mT4uH0kSu32HprZ34o9tw+zvZLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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