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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb050723d328c21c0e57b42870aaae38cfb2279ceb1cd9145f59ca7fea14e18' 
  AND token = 'bpKvk5FcLgjqwAarvCCfAZF9Ock2a6urexvFyfrrjFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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