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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecdb77b9ce419981fc5a2aeb2839ed91931c8c3eeaa8b72346333593804b04b' 
  AND token = 'FRh1ntdf+jobR6v7ObSq77RO9xZ0xnNUgj1UaphhDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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