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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bb72868b606652e19a1fb520ade9863d182014f3c4647d6e3e4b29c0219e67' 
  AND token = 'GjLDBYYDax2NMie+wcJhGLh8TXqmm5usTDPQ9mol8cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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