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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df8d317019269cb7a31c8fc108ee9ae925976de99723e02ac9d1d6a36579d01' 
  AND token = 'pgA8/18YVf32u+WehleEme4IVqNNofA7jEwJj6EiSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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