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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efbd0e6945bce0aff54fbbb89da7bdd924e15209cd8c42941e821c0ab89dc18' 
  AND token = '860FmTaMcsmIcpQ071IFemNqrz86DnbCmYpuiCHfrWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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