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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02318e0050b0f25061444d399d6746aa1501a85774b7a5dff8644b292a6b0eba' 
  AND token = 'LVvQIgbpD4gH1hlmcrgal92nUBZDURW9jVoCmpga2/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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