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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fcc85623f9a1349923abe9491259aae8ba8e6dea11e9f8860d963293b6b65b' 
  AND token = 'soPgRbX94z1KrUELPDAv/XaJsCma5dj0JsPFf0dPzi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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