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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686d8956bfd81337515a21d2030ca708c529b46cc74f03394eaae8952db3c73a' 
  AND token = 'mSvbQCnK0KtXjxy9KhFFB0ugcCCO7X3dfbCr+8J0r8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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