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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8619c4c40be135f85e382c9e8fa2a6f0b7896cac606b7e88ff5518324ca02d86' 
  AND token = '9Z5sO5hxDWO7gls7sKzAqSuP3S7L+0mpmDBe7FV70bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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