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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415fbfe291d19cbe1406dc43275a31ab7ce3d9ca573263f2bc8131e1beed799a' 
  AND token = 'UjQoljK9ee+3zrHKlRPRmc/6u5l2LLlMLP7n0AgS06c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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