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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78235d0eb1b6c0a7c65cd746e53c1668c423c3fa36a42b1780d72054a673592' 
  AND token = 'ZpuDfYZOxWe5J97Ol7/74dl9u+GG/iUfa70JH0bwWxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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