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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12eefe9c148d9f514c6177fcc42741c9f15d267413a6a1c779997d7eee32579d' 
  AND token = 'DnDOvWZ3oXoTkJ/IuTGwBplJxTRar0UyqHfzC0LYeHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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