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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d7bff1e8ca58537309fc6c4c5fbb4de1adaeb5785cdecfa0ba164c415d0201' 
  AND token = 'EA2hCkx7IdtohRbzTSnqwi1tscnj2aKDvBjXwp0Q/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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