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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0413acf4cd4c9b831c3c2c1c800157c5e4a4341ff1bb0c3f88afb62eb3b5f1cc' 
  AND token = 'Zd995bAMk+emwWoDTk8hj1lm2phEJK5Y3htfS5O2DoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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