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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676ba60085b978e5166c934641815443346516d0195f44e7827ef9f9443f4cc3' 
  AND token = 'zT620mZ7uZAR8niynywFuIK1IRt+qbDwNTP+cXmglUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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