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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64776f1bdb0cc39cfcf3b1cd8dd24980eb767d6e6b6b17bfca7ca60a8b0c9b25' 
  AND token = '29IfC8aD5+jcII/Zx1aUwW5jChKE/9P38PptRftwn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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