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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7f5176ebbe01fb8c13050ac8232e0d68d35f194e849f12d3c17d941050d70b' 
  AND token = 'hCO34OqsR1JXlgn09rU749Y3gxnO5abxnX000KkPXLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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