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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d4f4c3bffdd988fdfcbb7f527633e031ab277a8fa93676fef1cd7313fc689e' 
  AND token = 'V9t631dTqIBdO2B8Fh58+4W7DXQT7oiQT2FJclZFyeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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