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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177eab4e26fe1b1a4aacb0d5c4339ba3bbdc32ef93441596561cf478d32085ef' 
  AND token = 'pw/tzgwWMCjTgkuLbNX3JpfWMs5bIaUOv47252bWrg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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