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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04a9ffaff8c70a9dd45a6413988d455f30e9f3f8ebec4916818f11b32e25543' 
  AND token = 'A5XoKa1RhV5NYPCR5P9XtvbS2UtylUcMmz1BMiLRiBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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