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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d92aa9a2fcedbe94a8ca14cab64dcbfc36f268dd5a43af7e4c7efa6ae39ebda' 
  AND token = 'wZp3A5h4g+tiP9DP2q1eyA01Fjzz287xKtFpKkGpzmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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