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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e474f64f55404065aa679c13f569895f2a00f82c46a2e3499ba512a64bd831e7' 
  AND token = '1Tzs6KbQzVpSBYBz3+xJ678dKZNp7nzVx9S6u1lPGIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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