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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe347b3991dd8a76bd756804d72796ae5cbd4b51614f0c6c26c32d242950e3b6' 
  AND token = 'uOYO/0UP50LwWg7y4SxENJw6kpuAYmvK0Bch5WB8aeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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