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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e28468f7b8324b90e2243d53b6d13f08de967f86e8fbe977b91a4786f7a63c' 
  AND token = 'BikGWlMBfxsWEZSUfVQSiAJX0NHAQHjbf/8ApcnFwrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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