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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1aaf55c4776465ada39f47d8e9b6676930728616e32e4386594e20ced53664' 
  AND token = '2Es/vqNs//IBp5exmFseRxvVo62hMrXf7mTO5/fzTGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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